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e-lub [12.9K]
2 years ago
13

Solve the missing variable. Show your process please because I did the other three on my homework sheet but I really struggle wi

th math. Will definitely give brainly because this means a lot :)
-8.4b - 4.2 = 12.6

Is this -2 or?
Mathematics
2 answers:
kotykmax [81]2 years ago
5 0

Follow these steps:

-8.4b - 4.2 = 12.6

Add 4.2 on both sides:

-8.4b = 16.8

Divide by -8.4 on both sides to give you the final answer of:

b = -2

So you're answer is indeed correct! Hope this helps and that the steps are clear enough!

tester [92]2 years ago
4 0
The big intention behind every step you take in these "find the value of x" problems is to isolate the x by doing PEMDAS in reverse and using the opposite operation. So I would do first is add the 4.2 on both sides. This is so that the 4.2 on the side of the x is canceled out. This makes
- 8.4b = 16.8
From here, since the opposite of multiplying is dividing, you divide both sides by -8.4. You can use a calculator to find the answer but you get
b =  - 2
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I know you want to answer this question.
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Apply exponent rule: (a^{b})^{c} = a^{bc}:

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(2^{x})^{-1} * 2^{4} - 3 = (2^{x})^{2} * 2^{-6} - 2

Rewrite the equation with 2^{x} = u:

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Solve u^{-1} * 2^{4} - 3 = u^{2} * 2^{-6} - 2:

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Solve for u:

u = 8

Substitute back u = 2^{x}:

8 = 2^{x}

Solve for x:

x = 3

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